1与在Cu,TMEDA和BrCF 2 CO 2 Et之间形成的铜配合物的开环反应以适中的产率产生旋光的4,4-二氟谷氨酸衍生物11a-d。环状氨基磺酸盐1与氟取代的芳基氯化镁的反应是通过铜催化的格氏试剂1,4-加成到原位形成的脱氢丙氨酸2上进行的。不论反应条件如何,氟化有机锌衍生物对1均不反应。而是分离了1与DMF的反应产物。
The regio- and stereoselective ring opening of 1,2- and 1,3-sulfamidates with trifluoromethanethiolate anion is reported. This direct introduction of the whole SCF3 motif is a straightforward synthetic routetoward β- and γ-SCF3 amines and α-amino acid derivatives. The utility of this reaction was further illustrated by incorporation of Cys(S-CF3) into di- and tripeptides.
Bromophenyl magnesium reagents generated via a Knochel type magnesium halogen exchange of aryl iodides undergo regioselective ring opening of cyclic primary and secondary N-Boc sulfamidates in good to excellent yields. With secondary sulfamidates the reaction proceeds with clean inversion of the stereochemistry. This protocol complements the ring opening of aziridines with bromophenyl metal reagents and extends its scope to secondary substrates. (C) 2011 Elsevier Ltd. All rights reserved.